diff --git a/feeds/mcu/mcu/files/mcu.hotplug b/feeds/mcu/mcu/files/mcu.hotplug
index 461c3f462..54b17963f 100644
--- a/feeds/mcu/mcu/files/mcu.hotplug
+++ b/feeds/mcu/mcu/files/mcu.hotplug
@@ -92,6 +92,18 @@ mcu_hotplug_setup() {
 		sect="${sn:0:8}_usb"
 		mcu_logi "no matching MCU config found, adding new (disabled): '$sect'"
 
+		[ -d /etc/config-shadow ] && {
+			uci -c /etc/config-shadow -q batch <<-EOF
+				set mcu.${sect}=mcu
+				set mcu.${sect}.interface=usb
+				set mcu.${sect}.bootloader=mcuboot
+				set mcu.${sect}.sn=$sn
+				set mcu.${sect}.disabled=1
+				EOF
+
+			uci -c /etc/config-shadow -q commit mcu
+		}
+
 		uci -q batch <<-EOF
 			set mcu.${sect}=mcu
 			set mcu.${sect}.interface=usb
diff --git a/feeds/mcu/mcu/files/mcu.sh b/feeds/mcu/mcu/files/mcu.sh
index 012ef6e4c..4fd5b3665 100644
--- a/feeds/mcu/mcu/files/mcu.sh
+++ b/feeds/mcu/mcu/files/mcu.sh
@@ -351,6 +351,11 @@ mcu_sn_check_and_update() {
 
 	[ -n "$sn_dev" ] && {
 		if [ -z "$sn" ]; then
+			[ -d /etc/config-shadow ] && {
+				uci -c /etc/config-shadow -q set mcu.${SECT}.sn="$sn_dev"
+				uci -c /etc/config-shadow -q commit mcu
+			}
+
 			uci -q set mcu.${SECT}.sn="$sn_dev"
 			uci -q commit mcu
 		else
@@ -424,6 +429,11 @@ mcu_fw_check_and_update() {
 		[ "$active_slot" = "1" ] && firmware="$slot1_fw"
 
 		[ -n "$firmware" ] && {
+			[ -d /etc/config-shadow ] && {
+				uci -c /etc/config-shadow -q set mcu.${SECT}.firmware="$firmware"
+				uci -c /etc/config-shadow -q commit mcu
+			}
+
 			uci -q set mcu.${SECT}.firmware="$firmware"
 			uci -q commit mcu